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Chemismus Ca2Al3(SiO4)3OH
Mineral class Group silicates (Sorosilikate)
VIII/C.23-100 (after Strunz)
Crystal system orthorhombisch
Crystal class orthorhombisch-dipyramidal 2/m2/m2/m
Color colorless, yellow, green, pink, red, blue, grey
Line color white
Mohs Scale 6 to 7
Density (g/cm³) 3,15 to 3,37
Gloss Glass to Perlmutt gloss or matt
Transparency transparent, translucently to obscure
Break Uneven or conchoidal
Fissileness Completely after {100}, {001}
Habitus Prismatic crystals, massive, radialstrahlige, stengelige aggregates, grainy
frequent crystal faces (100), (101), (110)
Twin accomodation no
Refractive index
(optical orientation)
0,005-0,020 ; Biaxial +
Weak to strong (Tansanit)
of the Zes-axis
2vz ~ 0° to 69°
weitere Eigenschaften
Phase conversions
Melting point
chemical behavior
similar minerals Klinozoisit, Epidot, Tansanit, Thulit
Radioactivity no
Magnetism no
special characteristics wärmeempfindlich, Farbänderungen möglich



For the first time 1805 on the Saualpe in Kärnten found, he was originally called Saualpit. Zoisit kept its name later by the Austrian buyer and mineral collecting tank victory mouth baron von Zois (1747-1819)
  Education and discovery sites
Zoisit forms tertiarily under regional-metamorphic transformation of basic Magmatite to lime silicate rock, green slates and Eklogiten.Hoher pressure and water is a condition for its emergence.
Zoisit is divided into the blue Tansanit, the manganiferous reddish Thulit and the green-black-red ruby Zoisit.

All Varietäten finds as gem stone use.
  Falsification and imitations

The valuable Tansanit is only falsified by glass or as Doublette.


Specialized trade Michael Utzerath GmbH

Fly to the places where the stones have their origin!

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